Microbial diversity of eolian dust sources from saline lake sediments and biological soil crusts in arid Southern Australia

Raeid M M Abed, Alban Ramette, Vera Hübner, Patrick De Deckker, Dirk de Beer

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

While microbial communities of aerosols have been examined, little is known about their sources. Nutrient composition and microbial communities of potential dust sources, saline lake sediments (SLS) and adjacent biological soil crusts (BSC), from Southern Australia were determined and compared with a previously analyzed dust sample. Multivariate analyses of fingerprinting profiles indicated that the bacterial communities of SLS and BSC were different, and these differences were mainly explained by salinity. Nutrient concentrations varied among the sites but could not explain the differences in microbial diversity patterns. Comparison of microbial communities with dust samples showed that deflation selects against filamentous cyanobacteria, such as the Nostocales group. This could be attributed to the firm attachment of cyanobacterial filaments to soil particles and/or because deflation occurs mainly in disturbed BSC, where cyanobacterial diversity is often low. Other bacterial groups, such as Actinobacteria and the spore-forming Firmicutes, were found in both dust and its sources. While Firmicutes-related sequences were mostly detected in the SLS bacterial communities (10% of total sequences), the actinobacterial sequences were retrieved from both (11-13%). In conclusion, the potential dust sources examined here show highly diverse bacterial communities and contain nutrients that can be transported with aerosols. The obtained fingerprinting and sequencing data may enable back tracking of dust plumes and their microorganisms.

Original languageEnglish
Pages (from-to)294-304
Number of pages11
JournalFEMS Microbiology Ecology
Volume80
Issue number2
DOIs
Publication statusPublished - May 2012

    Fingerprint

Keywords

  • Aerosols
  • ARISA
  • Cyanobacteria
  • Firmicutes
  • Nutrients
  • Pyrosequencing

ASJC Scopus subject areas

  • Ecology
  • Applied Microbiology and Biotechnology
  • Microbiology

Cite this